/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.server.worker.runner;

import org.apache.dolphinscheduler.server.worker.metrics.WorkerServerMetrics;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadPoolExecutor;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;

public class WorkerExecService {

  /**
   * logger of WorkerExecService
   */
  private static final Logger logger = LoggerFactory.getLogger(WorkerExecService.class);

  private final ListeningExecutorService listeningExecutorService;

  /**
   * thread executor service
   */
  private final ExecutorService execService;

  /**
   * running task
   */
  private final ConcurrentHashMap<Integer, WorkerTaskExecuteRunnable> taskExecuteThreadMap;

  public WorkerExecService(ExecutorService execService,
                           ConcurrentHashMap<Integer, WorkerTaskExecuteRunnable> taskExecuteThreadMap) {
    this.execService = execService;
    this.listeningExecutorService = MoreExecutors.listeningDecorator(this.execService);
    this.taskExecuteThreadMap = taskExecuteThreadMap;
    WorkerServerMetrics.registerWorkerRunningTaskGauge(taskExecuteThreadMap::size);
  }

  public void submit(final WorkerTaskExecuteRunnable taskExecuteThread) {
    taskExecuteThreadMap.put(taskExecuteThread.getTaskExecutionContext().getTaskInstanceId(), taskExecuteThread);
    ListenableFuture future = this.listeningExecutorService.submit(taskExecuteThread);
    FutureCallback futureCallback = new FutureCallback() {

      @Override
      public void onSuccess(Object o) {
        taskExecuteThreadMap.remove(taskExecuteThread.getTaskExecutionContext().getTaskInstanceId());
      }

      @Override
      public void onFailure(Throwable throwable) {
        logger.error("task execute failed, processInstanceId:{}, taskInstanceId:{}",
            taskExecuteThread.getTaskExecutionContext().getProcessInstanceId(),
            taskExecuteThread.getTaskExecutionContext().getTaskInstanceId(),
            throwable);
        taskExecuteThreadMap.remove(taskExecuteThread.getTaskExecutionContext().getTaskInstanceId());
      }
    };
    Futures.addCallback(future, futureCallback, this.listeningExecutorService);
  }

  /**
   * get thread pool queue size
   *
   * @return queue size
   */
  public int getThreadPoolQueueSize() {
    return ((ThreadPoolExecutor) this.execService).getQueue().size();
  }

  public Map<Integer, WorkerTaskExecuteRunnable> getTaskExecuteThreadMap() {
    return taskExecuteThreadMap;
  }

}